compressed loads - Page 2

AllenJ · March 6, 2015, 02:52 PM

Quote:

I've put 20 to 30 shots in a row through one hole shooting at targets 1000 yards away

Bart, benchresters have problems breaking the 3" mark at 1k, how are you able to do so good?

Bart B. · March 8, 2015, 02:33 PM

Allen, that hole was the one at the muzzle end of the barrel.

Thought I'd put another perspective on one hole groups; all rifle's shoot zero MOA/inch at the muzzle.

That aside, I've seen a batch of test targets at Sierra Bullets plant in California with 10-shot groups of a production run of Sierra 168 HPMK's in their 100 yard test range. All were about 1/6th to 1/8th inch extreme spread; one hole groups in their own regard. I was given that special tour of their facility when I asked their ballistic tech why they full length sized all their test cases. He said that's the only resizing technique possible to get those groups one after another after another. He was the one that convinced me that neck only sizing was for ne'er do wells.

AllenJ · March 8, 2015, 02:52 PM

Quote:

Allen, that hole was the one at the muzzle end of the barrel.

I knew there had a to a twist I was not seeing, nice work sir

Will-j · March 9, 2015, 08:35 AM

SKIZ.... One IMPORTANT issue with compressed loads is whether the bullet will 'back out ' of the case due to compression pressure overriding neck tension on the bullet. Load three or four rounds to listed OAL and check them again a couple days later to see if the OAL has lengthened. If so, then the compressed load is not safe and could cause severe pressure problems along with the possibility of jamming a bullet into the rifling and possibly wrecking your rifle.
I know.....I learned from experience.

WILL

Longshot4 · March 9, 2015, 01:12 PM

Consistent volume less air gap seams to me to be the way to go. Loading data will often give you powders that volume closely match the bottle neck case. I load my K Hornet to best volume with a fine ball powder to seat the bullet on top. No air gap and the powder doesn't move. Makes a nice accurate load. Why hassle with packing powder. It just slows down the process.

Metal god · March 9, 2015, 02:34 PM

Quote:

One IMPORTANT issue with compressed loads is whether the bullet will 'back out ' of the case due to compression pressure overriding neck tension on the bullet. Load three or four rounds to listed OAL and check them again a couple days later to see if the OAL has lengthened.

This is what I've been thinking about when it comes to compressed loads . Now I'm just thinking out loud here . I'd think even if the bullet did not move . Maybe if the bullet is right on the cusp of letting go . Heavy recoil my push it over the edge and compressed loads still in the mag MAY let go of the bullet a tad .

just a thought

cw308 · March 10, 2015, 03:09 PM

Bart B, you got me with that one. I found myself staring at the screen.

March 9, 2015, 08:35 AM	#29
Will-j Senior Member Join Date: December 16, 2014 Location: SW Ga. Near Ft. Benning Posts: 251	Compressed loads SKIZ.... One IMPORTANT issue with compressed loads is whether the bullet will 'back out ' of the case due to compression pressure overriding neck tension on the bullet. Load three or four rounds to listed OAL and check them again a couple days later to see if the OAL has lengthened. If so, then the compressed load is not safe and could cause severe pressure problems along with the possibility of jamming a bullet into the rifling and possibly wrecking your rifle. I know.....I learned from experience. WILL

March 8, 2015, 02:33 PM	#27
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	Allen, that hole was the one at the muzzle end of the barrel. Thought I'd put another perspective on one hole groups; all rifle's shoot zero MOA/inch at the muzzle. That aside, I've seen a batch of test targets at Sierra Bullets plant in California with 10-shot groups of a production run of Sierra 168 HPMK's in their 100 yard test range. All were about 1/6th to 1/8th inch extreme spread; one hole groups in their own regard. I was given that special tour of their facility when I asked their ballistic tech why they full length sized all their test cases. He said that's the only resizing technique possible to get those groups one after another after another. He was the one that convinced me that neck only sizing was for ne'er do wells.

March 9, 2015, 01:12 PM	#30
Longshot4 Senior Member Join Date: February 22, 2014 Posts: 868	Consistent volume less air gap seams to me to be the way to go. Loading data will often give you powders that volume closely match the bottle neck case. I load my K Hornet to best volume with a fine ball powder to seat the bullet on top. No air gap and the powder doesn't move. Makes a nice accurate load. Why hassle with packing powder. It just slows down the process.

March 10, 2015, 03:09 PM	#32
cw308 Senior Member Join Date: September 2, 2010 Location: Plainview , Long Island NY Posts: 3,863	Bart B, you got me with that one. I found myself staring at the screen.