IT's not uncommon at all to have a gun that just will not shoot a particular brand or type of bullet. I've had it happen a lot. Going thru it right now with my 338. Best thing to do is change, see what happens.

I have tried both h4831 ansd IMR 4831. I have loaded from the max, going down .5 gr. to the min. NOt much change. At the spread of the SST's I would need 7oo yards for them to come back together.

Well, for one thing, nobody ever said for sure that they will EVER come back together. Chances are they will not. Second thing, if you are reloading starting at max charge and decreasing by .5 gr., you are doing things backwards, and may be inviting serious trouble. Better read a loading manual, and pay attention. Also, I don't see any advantage to switching from H4831 to IMR 4831. You need to try a totally different powder. Check your loading manual for an alternative type.

+1

what bullet weight are you shooting,i've yet to see a 270 that wouldn't shoot a 140grn bt hornady with a fairly hot load of imr4831

Some rifle will not shoot certain brands of bullets worth a darn due to
different barrel harmonics--I had 2 different rifles that wold not shoot
any boattails at all...And you can't crimp all bullets unless they have
the cannler or crimping groove..The Lee crimping die may help,but I
really doubt it..I would try another powder like IMR 4350 or some-
thing in that line..Or just stay with what you have..I know,we all
strive to get the best from our rifles but some will just NOT DO IT,
no matter what we do..If your doing good with the flat bases,then
there is your answer...Duf said for now..

I didn't start at the max. But by the time I was I was done had worked through all of them. It was just easier to state it that way.

Well, this is what you said, is it not?? And seriously, do you actually have a loading manual and have you read it thoroughly??

Some people who use the Lee "Factory Crimp" dies claim their accuracy is better when they crimp. But I don't crimp rifle or auto pistol ammo, and I have gotten excellent accuracy over the years with uncrimped loads. So I can't predict if crimping would help you or not.

My experience with reloading has told me that OAL is more important than powder charge in accuracy.

If you are loading different bullets to the same length they will be different distances from your lans, which means it changes your pressure considerably. This will affect your accuracy tremendously.

What do your groups look like? I know they are 2" but what do that look like? Are they "stringing" or do they look uniform? Do you have 2 that are close and one flier? If the shots are stringing, that tells me that you have too much pressure. Try shortening your OAL to reduce pressure. If you have 2 close and one flier, that tells me that you should try to build a little more pressuregoing a little longer OAL. Be careful tho, you don't want to go so long that you touch the lans.


Find a powder charge that will produce a uniform group and then change the length up and see how that affects your group. Then, if you find a length that you feel is the best that recipe will do and it's still not to your satisfaction, then change powder types and shoot at that same lenth to see what happens.