Ade1971 Posted September 12, 2020 Report Share Posted September 12, 2020 (edited) Hi All, I am looking for some advice on 308 load data using 195gr sierra TMK with vit N550. Best data I can find is 190gr sierra HPBT using vit N550 I was alway under the impression that the heavier the bullet the less powder but on the chart attached that seems different. Any advice would be appreciated. Thanks Ade Edited September 12, 2020 by Ade1971 missing information Quote Link to comment Share on other sites More sharing options...
Windswept Posted September 12, 2020 Report Share Posted September 12, 2020 You could try emailing Sierra, contact details on their site, and they may be able to help you. The data you posted matches the Viht site but my old Sierra load data has a max load for 190gr Sierra HPBT as 43.4 and a much lower max load for the 200gr Sierra bullets. This may be partly explained by the different test barrel lengths used in the data. Quote Link to comment Share on other sites More sharing options...
Ade1971 Posted September 13, 2020 Author Report Share Posted September 13, 2020 On 12/09/2020 at 12:08, Windswept said: You could try emailing Sierra, contact details on their site, and they may be able to help you. The data you posted matches the Viht site but my old Sierra load data has a max load for 190gr Sierra HPBT as 43.4 and a much lower max load for the 200gr Sierra bullets. This may be partly explained by the different test barrel lengths used in the data. Thanks, I have emailed them to see what info they have. Using the sierra app on android I found load data for them using TAC powder which I tried this morning with some success. Quote Link to comment Share on other sites More sharing options...
Windswept Posted September 13, 2020 Report Share Posted September 13, 2020 I tend to use TAC on much lighter bullets as it's quite a fast powder for 308. Ramshot does publish it's data online, funnily enough it differs a fair bit to my Sierra manual which has lighter loads compared to the Ramshot data. https://www.ramshot.com/load-data/ Quote Link to comment Share on other sites More sharing options...
Ade1971 Posted September 16, 2020 Author Report Share Posted September 16, 2020 Hi Reply from Sierra We have not tested that combination. But checking Viht’s manual, they list the 190 MK with N550. That load starts at 40.6 grs and they show a max of 47.2 grs. I see no problem starting at the 40.6 and then working up. Thanks Quote Link to comment Share on other sites More sharing options...
Ade1971 Posted September 22, 2020 Author Report Share Posted September 22, 2020 Loaded from 41gr to 45gr and at 45gr chrono was average 2540fps and everything thing looked good, pressure wise on the case and primer. Ade Quote Link to comment Share on other sites More sharing options...
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