Strange Day Good Day

[bruce moulds]

doug,
any testing method relies on the ability to aim accurately.
if you are using a ring foresight, this means using a ring which appears to have a hole 3x the diameter of the aiming mark.
i.e. there is an amount of white each side of the aiming mark equal to the diameter of the aiming mark.
200 yds should be far enough away to spread out the ladder meaningfully when doing an audette ladder test with a bpcr.
however there are issues which might give tricky results with an audette ladder with a bpcr.
we do not have free floating barrels like fclass rifles do, and our barrels rest on the sticks.
the audette method relies on vert as a measure of accuracy, and the above can induce vert.
the audette method also relies on 1 shot per charge, so if 1 shot has vert, the results are meaningless.
the ocw method also relies on vert, but it also requires 3 shot groups.
taking the centres of the groups is probably more statistically valid than relying on 1 shot.
also trends in group size can be an aid in gauging a load. if 1 group is way better than those each side of it, that is not a trend.
I am sure that there are nodes in our rifles. I have seen this at 990 yards when increasing charges started to shoot 10 shot groups lower than previous.
however this could have been bullets having reduced velocity due to increasing compression,
no chronograph, so don't know!
which raises another point re incremental testing with bpcr.
ladder testing and charge weight testing with smokeless has only one variable, namely charge weight.
we have to include 2 variables at once, the minute we start compressing.
one variable at a time is best, but we are not afforded that luxury.
there are guys on 6br that claim to do a ladder or other incremental test, then fine tune with seating depth successfully.
this is for want of a better term, a load of crock.
audette himself said that if you change one thing, e.g. seating depth, you need to run the whole test again.
keep safe,
bruce.