I put together a sammi spec 243 to try out in f class. It is a 7 twist barrel 30" and I intended to make full use of the new Sierra 110's. So far I have tried h-1000 kissing the rifling in a 30 round load work up at .5 grain intervals and tried rl26 .010 off the lands Nether one produced any groupings under .75 inch most around 1" or so I realize I haven't tied a lot of seating depths but I've not had a bullet be so contrary before
When do you give up on a peticular bullet
- Thread starter Shawnba67
- Start date
Keith Glasscock
Gold $$ Contributor
Try a known good bullet like the 105 hybrid or 105 VLD (target version) or 107 Sierra and see if it's the barrel or bullet. 3/4 MOA is totally unacceptable from a good barrel.
Good luck!
Good luck!
Well i recommend doing an OCW or ladder test. Pick the charge as recommend in the test. Then do the berger seating depth test. If nothing stands out move on.
For long range anything if you run a series of charges with a berger vld or hybrid jammed about 0.010 and you don't get 1/2 MOA groups it is either you or the rifle
Keith gave you a good answer. Maybe it's the barrel bedding or something else. I don't like slow powders for accuracy. They tend to be dirty. Look at the Dasher, they use R15 and Varget with the big bullets. I know the 243 is bigger but I feel H1000 is too slow.
You need to try a few rounds at a slight jump and a few with them in the lands about .010. Most times the Sierras I shot, liked them in the lands. Touching was usually the worst place. Matt
You need to try a few rounds at a slight jump and a few with them in the lands about .010. Most times the Sierras I shot, liked them in the lands. Touching was usually the worst place. Matt
Both powders when a certain charge gave good ES numbers (sub 20fps) I loaded a nosler RDF just kissing and got 1/2 moa or less groups
Keith Glasscock
Gold $$ Contributor
I would definitely try the other suggestions offered now that you've proven that the barrel is good. Do seating depth, try other primers and powders.
There is always the chance that the barrel doesn't like that bullet. I would try another few groups, then move to another bullet if things don't improve.
There is always the chance that the barrel doesn't like that bullet. I would try another few groups, then move to another bullet if things don't improve.
dragman
Site $$ Sponsor
A lot goes into it.
If it's a proven combo powder bullet, out of a proven gun and just a new barrel I will throw a barrel away quick if it isn't acting right. No sense in wasting powder, primers, bullets and the most important time.
If it's new like others said there is lots of stuff that can contribute just as much as bullet or powder choice.
If it's a proven combo powder bullet, out of a proven gun and just a new barrel I will throw a barrel away quick if it isn't acting right. No sense in wasting powder, primers, bullets and the most important time.
If it's new like others said there is lots of stuff that can contribute just as much as bullet or powder choice.
Personally, I think H1000 to be a bit too slow. If you did find an accurate node, the window would most likely be very narrow indeed. I would start with RL-23 or H4831SC. I think you will be impressed. If either one of those powders don't at least show some real promise, then go to a different bullet. As far as "kissing the lands" is concerned, either go 7-8 thousandths IN or 5 thousandths OFF for starters. Just kissing the lands means some are in and some are off, even if it's by a little>>>> not good for accuracy..
dmoran
Donovan Moran
+1... agree with Ben on both points.
Myself, 005 to 010-IN is typical of where I start.
Good luck
Donovan
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