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Joined: Aug 2020
Posts: 10
New Member
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OP
New Member
Joined: Aug 2020
Posts: 10 |
I recently de-coppered the barrel of my old .243 Rem M700 using Montana Extreme. Fired a 3 shot fouling group with Winchester Deer Season 95 gr loads that printed 5/8 of an inch. Then 95gr gr partitions in a handload over 41gr of H4350 that “grouped” at 3 to 4 inches. What the hell???
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Joined: Nov 2004
Posts: 17,265
Campfire Ranger
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Campfire Ranger
Joined: Nov 2004
Posts: 17,265 |
Your rifle prefers the factory ammo?
"I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man."
Thomas Jefferson
GeoW, The "Unwoke" ...Let's go Brandon!
"A Well Regulated Militia" Life Member
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Joined: Aug 2020
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New Member
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OP
New Member
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Joined: Oct 2013
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Campfire Ranger
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Campfire Ranger
Joined: Oct 2013
Posts: 18,917 |
Put the gas to that Partition load.
On occasion Partitions like to be pushed hard to get top accuracy.
The last time that bear ate a lawyer he had the runs for 33 days!
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Joined: Mar 2005
Posts: 26,247
Campfire Ranger
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Campfire Ranger
Joined: Mar 2005
Posts: 26,247 |
I recently de-coppered the barrel of my old .243 Rem M700 using Montana Extreme. Fired a 3 shot fouling group with Winchester Deer Season 95 gr loads that printed 5/8 of an inch. Then 95gr gr partitions in a handload over 41gr of H4350 that “grouped” at 3 to 4 inches. What the hell??? Did you check distance to lands between the two bullets? And yes, I understand the NBT’s are factory. Pull one of the NBT’s and use a fired case from the same box of ammo and check.
Casey
Not being married to any particular political party sure makes it a lot easier to look at the world more objectively...
Having said that, MAGA.
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Joined: Dec 2019
Posts: 3,037
Campfire Tracker
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Campfire Tracker
Joined: Dec 2019
Posts: 3,037 |
Hell, I'd be happy with 5/8 inch 3 shot group with cheap factory ammo. Winchester Deer Season is available everywhere. Grab a few box's and go hunting.
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Joined: Nov 2006
Posts: 10,796
Campfire Outfitter
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Campfire Outfitter
Joined: Nov 2006
Posts: 10,796 |
Maybe your hand loads just suck
Mathew 22: 37-39
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Joined: Aug 2010
Posts: 48,047
Campfire 'Bwana
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Campfire 'Bwana
Joined: Aug 2010
Posts: 48,047 |
I recently de-coppered the barrel of my old .243 Rem M700 using Montana Extreme. Fired a 3 shot fouling group with Winchester Deer Season 95 gr loads that printed 5/8 of an inch. Then 95gr gr partitions in a handload over 41gr of H4350 that “grouped” at 3 to 4 inches. What the hell??? Was the handload something you previously worked up, or something you just threw together? Your OP is a little vague. Thread title talks about "decoppered 243", and then you state your rifle shot a 5/8" group. No info to go off of as far as I can tell.. You are either telling us you shot 1 3 shot group from the factory ammo, then moved on to the handloads. There's not statistical basis to go off of there. Shoot some 5 shot groups with the factory ammo. If you are still shooting 5/8", your rifle is good to go. You should be able to best any factory made ammo, with a tailor made handload. That is if your rifle likes the bullet you are using.
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style. You want to see an animal drop right now? Shoot him in the ear hole. BSA MAGA
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Joined: Dec 2002
Posts: 6,929
Campfire Tracker
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Campfire Tracker
Joined: Dec 2002
Posts: 6,929 |
I could never get the 95 gr Partitions to shoot worth a darn in my .243 Win 788. 100 gr. and 85 gr. are sub-MOA. 95 gr. sucked
Selmer "Daddy, can you sometime maybe please go shoot a water buffalo so we can have that for supper? Please? And can I come along? Does it taste like deer?" - my 3-year old daughter 
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Joined: Aug 2020
Posts: 10
New Member
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OP
New Member
Joined: Aug 2020
Posts: 10 |
Thanks. Interesting - I have a box of the 85 gr Partitions I haven’t tried yet. Will also experiment a bit with seating depth and powder charge. Was worried I might have exposed a very worn throat when I did the thorough decoppering, but then odd it was happy with factory ammo.
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Joined: Dec 2014
Posts: 2,961
Campfire Regular
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Campfire Regular
Joined: Dec 2014
Posts: 2,961 |
Put the gas to that Partition load.
On occasion Partitions like to be pushed hard to get top accuracy. ^^^^ This. 41 grains of H4350 is a pretty light load.
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Joined: Oct 2013
Posts: 18,917
Campfire Ranger
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Campfire Ranger
Joined: Oct 2013
Posts: 18,917 |
Thanks. Interesting - I have a box of the 85 gr Partitions I haven’t tried yet. Will also experiment a bit with seating depth and powder charge. Was worried I might have exposed a very worn throat when I did the thorough decoppering, but then odd it was happy with factory ammo. Powder charge is where I would start. Some room above 41 grains in my opinion.
The last time that bear ate a lawyer he had the runs for 33 days!
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Joined: Jun 2009
Posts: 3,969
Campfire Tracker
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Campfire Tracker
Joined: Jun 2009
Posts: 3,969 |
When you luck into something your gun likes, go with it. Sometimes there is no reason why a gun prefers one thing over another.
But before you give up on the partitions, give it a little more gas, like others suggested.
"I was born in the log cabin I helped my grandfather build"
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Joined: Jan 2008
Posts: 2,139
Campfire Regular
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Campfire Regular
Joined: Jan 2008
Posts: 2,139 |
If it previously grouped ok with the partition load, your barrel may need a few more fouling shots to settle down and like them again. Might be worth wasting 20 or so partitions to find out.
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