07-04-2020, 05:35 PM
I'm shooting the barnes 100ttsx in my howa HB for hunting. I'd been using some factory Alexander Arms 120tsx ammo that I got on sale. For my Remington bolt actions I do the same as you for distance to the lands. I was not able to remove the ejector from the howa, and my online search revealed that without a super punch to remove the pin...many others had the same issue. I used the sinclair tool to find the approximate distance to lands. I had not done this before, so I don't know how accurate it was.
Anyway, I got a COAL of 2.308, and CBTO of 1.7645 for the Barnes at the lands or close to them. Usual disclaimer that this is what I found for my rifle. I settled on 29.0 gr VV133 and ~80 thou jump for a CBTO about 1.685 and COAL of about 2.226...if I measured everything correctly. This gave me a sub moa 5-shot group at 100 meters. I don't think that I have 100 rounds through the barrel yet.
If you can't get the ejector out and/or don't have a hornady/sinclair tool, I think that kmon's method would at least as good.
Edit to add...it really depends on the bullet and what you are using the rifle for as the longest COAL may not necessary be the best.
Anyway, I got a COAL of 2.308, and CBTO of 1.7645 for the Barnes at the lands or close to them. Usual disclaimer that this is what I found for my rifle. I settled on 29.0 gr VV133 and ~80 thou jump for a CBTO about 1.685 and COAL of about 2.226...if I measured everything correctly. This gave me a sub moa 5-shot group at 100 meters. I don't think that I have 100 rounds through the barrel yet.
If you can't get the ejector out and/or don't have a hornady/sinclair tool, I think that kmon's method would at least as good.
Edit to add...it really depends on the bullet and what you are using the rifle for as the longest COAL may not necessary be the best.