You may already know this, but Lefevers and most other older doubles should not be shot with standard higher pressure off the shelf factory loads. Low brass does not mean low pressure. You might get away with factory loads for a little while, but it is very hard on 100+ year old wood and may quickly shoot loose as you hammer the bolting surfaces in the action. You also might want to check your chamber length to make sure it is not less than 2 3/4".

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