Throat Erosion

[Kodiak99317]

I have been keeping a very close eye on the amount of throat erosion on my 6/250 Imp. I’m shooting 105 Lapua bullets set to just touch the lands with 37.1g of H-4350 at approx. 3070 fps and after 730 rounds down range, my seating depth has grown .044” longer. Not a big problem since I can chase the lands for another 3000 rounds approx. if need be or until the barrel goes south.

I know my old smith told me back when he shot Silhouette, using W748, after one year, he had to move the seating depth some .080” to maintain the “just touch” mark and the following year, he switched to N202 and after another year, he only had to move the depth of the bullets out another .008”.

I’m using H-4350 since I’m in Canada and Higginson carries it so no worries about running short, same reason I use Lapua 105’s, easy of getting more. I did not want to use components that I can not get easily in Canada.

I read on one forum that H-4350 was a real barrel burner, something was in a post like "If you want to burn up your barrel, use 4350 for 1000 rounds." Is this statement true about H-4350, being a barrel burner?

How does H-4350 compare to the Viht powders (i.e., N-150 or N-550 or N160), or say Varget regarding throat erosion?

Finally, does jumping them reduce the erosion any vs "just touching"?
No sense trashing a good shooting barrel too soon eh!

 

[prosper]

I've never heard that before. It IS an extruded powder, and some folks think that extruded powders wear barrels faster (than ball). It's also a very slow powder, so is often found in overbore cartridges which by nature wear faster.

It's a single-base powder, so should burn cooler than the viht 500 series or reloader series, or most ball powders. That should contribute to barrel longevity.