The stem on the LA bolt head (LA-BH) is longer than the ones on the SA-BH and so the firing pin will stop short. You can take a LA-BH and have it shortened to the same length stem as a SA-BH. Any local machine shop should be able to easily handle this. Remember to have them put the countersink in the back of the stem as it will be removed when the LA-BH is shortened to the SA-BH stem length. You will have to readjust your firing pin protrusion to this bolt head but it will work just fine. I am running on one I modified right now with my 6WSM.
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