Just some advice please.
The original batch of 222 I had grouped like a clover leaf. The replacement batch shoot awful approx 2 "plus. Have fired 13 cartridges with 2 of the necks splitting. 1 right on the end of neck the other split nearer the shoulder. The COL is on average 0.0235 " shorter than the original batch plus the primers are a different colour.
Difference in purchase time between batches is 14 months but I do not know how old the original batch was. I believe the new batch to be recently made as I have been waiting for 6 months for this batch as the manufacturer has given these as a goodwill gesture due to loading 2 bullets in 1 case, albeit in a different cal.
Should there be such variation on one batch to another ? Are such variations likely to cause such a difference in the grouping?
So I have now fired the rifle with different makes and all is well with grouping, so my rifle doesn't seem to like this new batch.
I have 127 of these left. So is it safe, to use a kinetic hammer to draw the bullet forward in the neck and then seat to the original batch length to see if this makes a difference. The other alternative I have would be to pull all of them and work a load from the bullets and powder but as I don't know the powder type. would this be safe. I.e as where to start with a load weight. I do still have 4 cartridges of same make of 2 different batch numbers which the rifle loved. I could pull these to measure the powder to do a comparison.
so any suggestions on best way to deal with these ?