need 338-378 with 300gr matchking data

[lazylabs]

I need starting data for 300gr matchkings in a 338-378, please specify factory or custom chamber.

Thanks, Brad

 

[James H]

http://www.hodgdon.com/data/rifle/3878wea.php
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Sierra starting loads for 300gr SMK
IMR 7828 87.0gr
H-1000 90.5gr
RE-25 90.0
H870 98.5
AA8700 98.5

S.A.M.I chambers

 

[Budman]

Mine has a minimum sammi chamber and I can reach the lands at 3.90 col, RE-25 shot ok but could not get the speed I was looking for. US869 at 115 grains runs 3000 from a 34 inch barrel and no pressure signs. I did try WC872 and was at 115 grains also but speed was less then the US869 and I needed a summer and winter load with the difference being 2 grains.

 

[lazylabs]

Thanks I have RL 25 and 7828 so I loaded 10 of each and will give them a try. I am glad they started selling the 300's in smaller batches so you can try them for less than $100. Thanks

 

[abinok]

AA-8700 98.5 grains - 110.0 grains
H-870 98.5 grains - 109.0 grains
H-1000 90.5 grains - 98.0 grains
H-4831 84.0 grains - 90.0 grains
IMR-7828 87.0 grains - 93.0 grains
Retumbo 100.0 grains - 106.5 grains
RL-25 90.0 grains - 99.0 grains
US-869 108.0 grains - 115.0 grains