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Opinion on group shape
- Thread starter Codum
- Start date
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How long between shots ?
What weight barrel?
What weight barrel?
10-15 seconds between shots. Ambient air temp was 45-50??? #5 PAC-NOR.
Diagonal can typically be fixed with neck tension
seems like more and more people are liking 4-5 thou these days.
jjmp
Well-Known Member
Wonderful group worth Crowing about , if I'm not mistaken, that's your fast twist 270 semi-custom that you regaled us about . Imho that the Rifleman's Rifle Congratulations and thks for sharing, with us ,Do come back now Ya-hear !!!,
I've noticed smaller calibers like more.. for me anyway
Ok. I do anneal between every firing, I have a Forster FL BR die without a expander ball, I use a L.E. Wilson expanding mandrel die (.2755 is what it measures with my micrometer). The 4-5 thou that is being mentioned?? Is this suggesting the neck diameter be 4-5 thou smaller than the bullet diameter? .277- 5 thou = .272 for neck reamer size. My neck tension is too loose?
lancetkenyon
Well-Known Member
With that group at 300, I wouldn't change anything unless you are going to shoot F Class or BR with it.
More rounds on target is the first place to start. It might round out over many rounds. Trigger pull is the next thing to look at. A slight inconsistency in trigger pull often leads to horizontal stringing. If you're going to test things like neck tension test it hard with 25+ round groups. It's very easy to mistake noise for a change with low round count groups, especially when you're chasing the last little bit of precision.
It could be too loose and yes 4-5 smaller. I wouldnt just jump too that though. Id go in .001 increments. See if it comes together. If you dont shoot real far id leave it. But if you just like tinkering thats what i would do.
Chesterrose79
Well-Known Member
I agree with biednick Load up a larger sample size and re shoot. How many rounds in the barrel? How many firings on the brass? My FTR riffle never shot amazing until I had the brass fully fire formed with two shootings. Then I did another seating depth test and found a real nice group.
lance has a valid point, and iI would shoot it at 500-600 and see what it prints. That may ease your mind and allow time spent elsewhere.
or shoot at your personal max range what ever that is.
or shoot at your personal max range what ever that is.
