300 Win 230 Berger Hybrid OTM Ramshot LRT - Data

martinakl

Well-Known Member
LRH Team Member
Joined
Nov 27, 2013
Messages
1,828
Location
SW IDAHO, 83713
I’m on the lookout for some N570.

I also ran N568 yesterday. Tons of accuracy potential but it was the slowest of the three. I’ll update with velocity data later tonight.

1.37” group over the 15 shots. 7 grains difference in beginning and ending load and still managed that group…

I think my gun likes the 230’s.
9C0CC385-FFE0-4702-A266-E86C30E7A51F.jpeg
 

martinakl

Well-Known Member
LRH Team Member
Joined
Nov 27, 2013
Messages
1,828
Location
SW IDAHO, 83713
Is this the standard slow twist barrel typical of 300 win mags?
I believe the marketing materials for this rifle are wrong and it's actually a 1:10 twist (not 1:11). There's some markings on the barrel that lead me to believe it's actually 1:10 twist. I did the cleaning rod test on it multiple times and came up with a 1:10 twist, on the dot every time. There's a few other posts out there that suggest other owners believe they have a 1:10 twist 300 Win Sako S20.

Tikka/Sako have recently updated the twists on some of their 300 Win offerings to 1:10.

For Example:

1632765813344.png


When you go to the configurator, it says they're 1:10 twist. All the marketing materials I've seen still say 1:11 (but, I haven't looked lately).
1632765972145.png


When I bought it, I figured I was a getting a 1:11 twist and was fine with it. Although, there were already reviews out stating it was actually a 1:10 twist, I was good with either. I started out testing the 205 Elite Hunters in this rifle. It wasn't until later I decided I needed to find out if it was really a 1:10. For my needs and level of concern, I'm confident it is a 1:10 twist.

It shoots the 205's & 215's well too. Even with the almost 3.6" of usable mag box, the 205's and 215's are jumping over 1/10th of an inch to reach the lands. 230's are almost touching the lands at max magazine length. I've only been testing max powder charges. 230's stood out the most in early testing. As far as accuracy is concerned, I don't think I need to mess with seating depth on them. I've only loaded at max magazine length, as a starting point (all bullets mentioned).

At this point, I have some good loads to revisit with all the different bullet weights. I'll have to stretch it out to confirm no loss in BC's on the 215's and 230's. 205's require a min of 1:11 twist. I figured I needed to get a 100 or so rounds down the barrel, to get get it broken in and some 1x fired brass. I've been having fun just messing around with different combo's.
 
Top