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killerv Offline OP
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I picked up a used Remington ss fluted CDL with a B&C stock a month or so ago. Order some norma brass, dies, etc. Anyway, this will be my first time loading for a weatherby mag. I trying out the 110 Accubonds.

Tried my first loads last night with 66.5 gr of some h4831sc I had on hand. From my research, not widely used in this caliber but I had it so I tried it. From what I'm reading H1000 or 7828 may be a better option, maybe even the RL22 but I hear it can be more temp sensitive.

Anyway, my first group was just under 2in @100. I've never had a group so large with my first handloads out of any rifle. I guess I've been lucky and I guess there is always time for a first. I know I still have a lot of loads to try.

I've always found the lands on my standard calibers and gone from there but I realize this isn't really an option with this one. So I guess my question is about overall max length.

One book as coal at 3.170 max, nosler had it at 3.209, so I got to looking at what other folks were doing for max coal, I'm seeing them way longer than what I mentioned and some folks loading to as long as the magazine will allow. I have a ton of room in my magazine at 3.209. I'm assuming the free bore helps keep the pressure down on these longer loads.

I guess my main question is how are folks coming up with these way over book max length when free bore is involved? Is it even necessary due to the freebore.
What powders have you found best for the 110 accubonds in this caliber?

Thanks, Matt

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I've never loaded 110 Accubonds, but I can tell you some jump to the rifling is not necessarily going to ruin groups. A friend of mine has a Vanguard in 257 Wby. that is bedded into a McMillan stock. It shot the factory ammo loaded with 100 grain Hornady Interlocks very well, so when I made up some handloads with that bullet on top of 7828 I used the same coal and it worked great.

If you want to try them seated well out there then start with them as long as the magazine will allow, that feed well, and that leaves 1/4" or more grip in the case neck. Then if you need to tune the length you only have one direction to go: shorter.

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Make sure your bullets are seated straight. I often wonder how much time and money people waste because they are shooting loads with ridiculous runout.

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I have shot the 257 Wby for many years. I have two both Mk V one with factory barrel and one I rebarreled with and Obermeyer 6R (yes you read it right 6R) both barrels are 26 inch length. I use IMR 7828 since it was introduced in the early eighties and I use 117 grain Sierra Pro-Hunter flat base bullets in front of 70 grains of 7828. Primer is a Federal 215 Mag. Both rifles will shoot this load close to an inch and I have used it to take many head of game. In my experience I cannot get any boat tail bullet to group anywhere near as good as the flat base ones. The first loading data that came out from IMR shows the 70 grain load going 3496 fps but I never got within 70 fps of that figure in either rifle. I suspect that the boat tail bullet lets early powder gas to escape around the base while the bullets travels the .378 inch free bore length. Flat base not so much. This is just my theory based on my experience. I will try IMR 7977 when stocks of my 7828 run out. YMMV

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My .257 Wby Vanguard Sub-MOA liked RL22 and the 100gr TTSX. OAL was 3.160" IRRC and just a touch over 3,600ft/s. Groups were 3/4" or under depending on me.


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Fed 215M 69/RL22 Norma Brass COAL: 3.240"

Usually shoots less than that

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killerv Offline OP
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thanks guys

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I load to factory length. I have a 700 CDL. The 110 Accubonds give me 3/4 groups. I always start at factory length, see how they shoot. If it's sub MOA, it's fine for hunting. I used to fool around with seating depth, but don't have time anymore.

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A 257 is presently doing a little less than MOA with Reloader 22. Some friends, however, have me thinking IMR 7828 just might tighten it up a bit more. Seems to be a great powder for all the cartridges in the 240 to 300 realm. Let us know how things work out.

Last edited by 1minute; 09/28/17.

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R25 is another great powder to try. I've had best luck with 7828 and R25 in my last 3 257Wbys. Don't worry about book OALs with this cart when you have a factory freebore, just find what works best for accuracy and still functions in the mag. In my current 257(Rock #4 10tw with std freebore) I seat just about all loads at 3.25"

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Originally Posted by hanco
I load to factory length. I have a 700 CDL. The 110 Accubonds give me 3/4 groups. I always start at factory length, see how they shoot. If it's sub MOA, it's fine for hunting. I used to fool around with seating depth, but don't have time anymore.



I usually do to. I went with the 3.209 because it was nosler data, instead of the 3.170 I was seeing elsewhere. What powder are you using if you don't mind me asking?

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I load 110 AB's to 3.22 over RE-22. That COL gave me the best accuracy.


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My 257 doesn't have the freebore so I can't comment on the OAL, but I started with 7828 SSC, and it shot so well that's where I finished.


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killer,

Your on the right track with H-1000 and the 110 AB. It's proven to be one of the more accurate combos in my 257's. Additionally, H-1000 is an Extreme powder and not temp sensitive.

My go-to load combo however, is RL-25 and the Nosler 115 Ballistic Tip. RL-25 is magic in the 257. It's absolutely provided the best combination of velocity and accuracy in all 3 257's I've owned. Should find your sweet spot between 69.5 and 71 gr. Expect velocity to be in the 3300-3450 range with 115's. Don't fret about bullet construction with the BST. Even driven at 3400 fps, it's held up splendidly on thin skinned game. It's much tougher than most give it credit for. Plus, for a .257 caliber bullet, it has a decent BC of .453, which is much better than most other .257 cal offerings.

As for seating, I typically always find my best accuracy when the bullets are seated deep...less than 3.20. This holds true for the 110 AB as well.

One point of interest to pass along in regard to the 110 AB. Be vigilant when approaching max loads using this bullet as it seems to be much more susceptible to pressure spikes than other bullets. I've never experienced this issue with the 115 Ballistic Tip.

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Thanks again,

yeah, i'm a ballistic tip fan, been shooting it out of my 270 for 15 years now and been developing loads for my new 708 with it. I'm a shoulder shooter so I rarely if ever have to track one. From what I've researched if your a shoulder guy, the ab and the barnes are the best bet at the speeds of a 257. There is guy who posts on our Georgia forum that he's seen ballistics and partitions literally fall apart on a shoulder, and he shoots strictly the ttsx now. I'll pickup some h1000 this weekend.

kman, I've got a cocentricity gauge coming. To be honest, I've never thought I really needed one for hunting loads, but I guess its a small investment to see if its me causing the issue when sizing and seating, etc. If anything, I'll be able to identify the off rounds and set them to the side for foulers or whatever.

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My friends and I have had a great success with our 257 Weatherby semi customs. Seven rifles (Dan has two) built using a slightly altered 257 Weatherby reamer with .100" freebore and a 1 1/2 degree throat angle. We only use 115 Berger VLDs. Lilja 3 groove SS barrels for all rifles. Five rifles use RL-25, one uses H-1000 and mine uses RL-33.


I would suggest you give RL-25 a try with your 110 accubond. I also tried RL-33 with the 110 accubond. It yielded excellent accuracy and slightly higher velocity.

Quite frankly I would rather use the 115 Berger VLD with its higher BC. It has no problem killing. To date the aforementioned rifles have killed 20 coues wt, 2 antelope, 6 elk and 4 mule deer. Some of these kills are very spectacular DRTs.



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OK, R-22, R-25, 7828 and H-1000 are all go to powders that should work well. To avoid chasing rainbows and to keep from buying a bunch of different components for different combinations (who has the time for that), I would do the following.

Pick a powder. Pick a bullet you would like to use then seat out to magazine constraints for reliable feeding. If no warm and fuzzy feeling happens, seat deeper with the same components. Still no love? Seat deeper again. You can load a box of rounds with 3 or 4 different seating depths quick and easy. One other thing, do not shoot more than 3 rounds without letting the barrel cool off. I usually bring ice packs (blue ice or cold damp towels) to cool down my .257 bee. Having a bedded barrel can help too when things start to get warm.

That all said, I have used the 110 NAB with R-22 with good results and we continue to load that in my son's CDL SF. This year I switched to a 100 gr TTSX and H1000 in my .257 and it is shooting around 1" with that load.

I don't load without a concentricity gauge. If you have bullets that are greater than .003, you can gently bend the neck in position to square things up.



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I've experimented considerably with two .257 Weatherbys, one Vanguard Sporter and a NULA Model 28, over the past 15 years or so. I haven't found any one powder to be the magic solution, and have tried a bunch, including RL-22, RL-25, RL-33, Magpro, Magnum, IMR4350 (the powder Roy Weatherby used when designing the round), IMR7828, Retumbo and some others I've no doubt forgotten.


But the most accurate load in both rifles used monolithic 100-grain bullets (whether the TSX, TTSX or E-Tip) and Ramshot Magnum. In the Vanguard this would regularly group three shots in 1.5" at 300 yards. That said, I recently tried H1000 and got very close to the same results.


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I have 40 years with this cartridge in 4 rifles, one of which was documented to the load to measure barrel life, but I want to again, open people's mind to the plain old everyday Hornady 87 grain bullet. The 100 grainer is now defunct, but that 87gn bullet was Roy E's favorite and I have used it on Fallow deer, wild goats, pigs and what not and it is vert decisive at 3800fps.

Just something cheap and easy to consider,
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Originally Posted by Dustylongshot
I have shot the 257 Wby for many years. I have two both Mk V one with factory barrel and one I rebarreled with and Obermeyer 6R (yes you read it right 6R) both barrels are 26 inch length. I use IMR 7828 since it was introduced in the early eighties and I use 117 grain Sierra Pro-Hunter flat base bullets in front of 70 grains of 7828. Primer is a Federal 215 Mag. Both rifles will shoot this load close to an inch and I have used it to take many head of game. In my experience I cannot get any boat tail bullet to group anywhere near as good as the flat base ones. The first loading data that came out from IMR shows the 70 grain load going 3496 fps but I never got within 70 fps of that figure in either rifle. I suspect that the boat tail bullet lets early powder gas to escape around the base while the bullets travels the .378 inch free bore length. Flat base not so much. This is just my theory based on my experience. I will try IMR 7977 when stocks of my 7828 run out. YMMV


Back in the 90's when I loading for the 257. I had Kleinguenther build me one on a k15 action. The old man being German hated to buy factory ammo to test rifles. Ask me to load some 257 for him. His load involved the Sierra 117 flat base with H4831. As I recall about the middle load in the Speer manual. Shot real well in the two 257's I owned . Never shot this load over a chronograph. Hasbeen


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