Even if you go to 130 grain projectiles they are still varmint bullets and too weak for pigs over weaner size
the 30/30 was designed as a Deer rifle to shoot 150 and 170 grain bullets the chamber is cut to suit those bullets and the twist rate
of 1:10" is for 150/170,
If you use a 150 grain and load it with the recommend start load it is not an overkill it is the high velocity that does the damage not the weight
unless you use Lee dies all other seating dies will crimp bullets
I still think your best move is cast bullets the 30/30 is one of the perfect cast bullet cartridges
give me a call and have a chat 021 0272 4412
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