Home Forums Reloading Big Game Rifles 6mm Rem, 100 grain speer and imr 4350

Have been loading 85 gr. sierra hpbt and wanted to try something different but could not find min\max for imr 4350 with the speer 100 grain spbt. Does 39 to 42.5grains sound right? I made two test loads of 40 and 41 grain. I have no desire to stretch max loads. I also have 4831 sc but haven't tried it with these bullets. 1-9" Remington adl. Pet loads welcome.

I looked on the Hodgdon web site. They have one load listed and I think it's with the 100gr Speer bullet. It said 43.5gr(MAX) of 4350 in the 6mm Remington. I have never tried it use at your own risk.
224TH

hodgdon

My Speer #12 states that max with IMR 4350 is 38.0 grains for 2698 fps. Does seem low to me, but that is what's printed in the book.

you had me worried -and I saw that too after seeing your post but that has got to be a minimum not a max - don't you think?
I am seeing others load 43 grain etc..

Have to apologize, I was looking at the 243! I will check when I get home on the 6mm.

Ken-Whatever load you decide on, that is a great deer and prairie goat combo. My Remington Mohawk 6MM has downed a truck load of deer and antelope using just that combination and it is the most accurate, compact and handy rifle I own.

I see you asked for data for the spbt. Speer cautions against using any other data for their 100 spbt and to use only their data. The Speer #13 shows for IMR4350 a start of 37.0 for 2382 fps and a max of 41.0 for 2676 fps. Pretty slow I think. Why their caution warning I can only guess. I would heed their warning for now. Suggest you contact them and see if they will clarify their reasoning.

My #12 manual lists the same.

Just read Speer data.

100grSPBT BC = 0.430 IMR4350 Max 41.0grs = 2676FPS

100gr Grand Slam BC = 0.351 IMR4350 Max 43.0grs = 2846FPS
105gr SP BC = 0.443 IMR4350 Max 43.0grs = 2846FPS
2 different bullets with different BC but with same pressure or should I say safe Pressure.

The BT bullet usually produce higher pressures and the charge weights are adjusted accordingly.

So the 105grSP has a higher BC and can produce a faster FPS with a little more powder and equal same safe pressure. Speer Manual #13.

Ken

i would try some hornady or sierra or nosler that don't have the warning. you do not say what rifle but, i would load to 2950 or 3000 and call it good.

man that seems awful slow - disappointment only on paper. I am growing fonder of slower anyway since 200 yards is on the long side for my turf. Thanks all. Think I will see if IMTR can shed some light- if I hear back will let you all know. I shot 40 and 41 grain loads yesterday. 40 grain were dead bullseye first shot, and pretty much touching the second so I am good to go already. Good news is 40 grain is my load for the 85hpbt too. I love not having to think much.

40 grains appears perfect for the 100 grain.

I'm shooting 43.5grs of IMR-4350 in mine with 100-105gr bullets.It shoots awesome groups and never had any pressure problems.It's getting just a tad over 3000fps.This was a book load.One of my old Lyman manuals shows 45.5grs of IMR-4350.I've never loaded any higher than 43.5grs and have been satisfied with the results.

looks like the lower ratings are specific to this bullet- CRAP! Wish I knew that before buying them. Would like something over 2600 fps - though in truth it likely won't matter to me in the field.

I've run 100 gr Sierra Prohunters to over 3000 fps easily with imr 4350. Hell, I've got an older Model 7 with 18.5" barrel in 6mm that will do 2900 with the same load.

Bill

I think Speer's later reloading manuals were written by their product liability attorneys, not their ballistics engineers. Probably as a result of one of their older manuals (number 9 or 10) that had some very heavy advertised loads for the 7mm Remington Magnum that drew some complaints about stuck bolts, and excessive pressures. In retesting their original data, they discovered their test rifle, a Savage 110, IIRC, had severe throat erosion and would safely digest powder charges that were indeed excessive in barrels that had newer shorter throats. I think, after that, Speer tended to err on the side of caution and pretty much throttled back all their loads compared to earlier manuals. Since every rifle is unique unto itself, the old rule about starting low and working up gradually is the only safe way to go. I find a chronograph helpful, particularly when using powders that don't have a lot of reloading data available. And while, the chronograph doesn't measure pressure, velocity is certainly a function of pressure and can help you to know when you should be really looking for other signs.

wow where did you pick up that info? Good stuff and believable. A shame and puts me in mind of the old Ruger triggers. Just wonderign id publishing loads like that wouldn't hurt sales. So- for everyone out there- what reloading manual would you recommend? I have a Lee already but think I need to supplement it.

I'm using 47.5 grains of RL22 with the Sierra 100 gameking which is very accurate in the same rifle as yours. This works a treat and the bullet is similar to the speer (not the same...obviously) so you may want to work up to that load.

Buy all the manuals you can--Sierra, Nosler Hornady, and yes, even a Speer.

Speer manuals went from having some the warmest loads to some of the most ridiculously mild loads in a few volumes.......

Speer #12 lists a 270W with 150 grainers and H4831sc max charge at 55 grains.....and then claims to achieve almost 2900 fps.....Jack O'Conner would've considered that a starter load.........


Casey

LBC,
What kind of velocity are you seeing and what length of bbl?



Casey