http://www.castbulletassoc.org/view_user.php?id=8162>Blindstitch
You said “would” instead of could and did not include a question mark, it is easy to assume you propose “Should Work” and that you were preparing to try that 4-5 grains of Green Dot in your 30-30.
The other matter, Glad you asked,
You have been blatantly misinformed with internet hooey:
“I have been told by several people that shooting lead cast without a gas check around 1400 fps has the potential for a molten lead ball making a mess of the rifle.”
You couldn't make this happen if you wanted to. Consider the barrel time of a bullet at 1400 fps. The powder doesn't even get the bullet warm. Friction will warm the bullet a little bit but not even close enough to melt bullet alloy. This hooey is born from cast bullet shooters that have no clue about bullet fit and have undersize bullets wobble down the bore, get distorted from gas jetting and shoot all over the place.
Load pressure is the correct determining factor for selecting alloy and choosing to use gas checks. Velocity is irrelevant to the correct selection. Gas checks extend the load pressure range of bullets and alloy hardness for plain based bullet selection should be based on load pressure for bullet hardness as well presented by Lee in their 2nd Edition , Modern Reloading and many other reliable ballistic texts on cast bullets.
You can prove the melting bullet hooey to yourself easily:
Put a lead bullet on a brick. move the hottest tip of a primary flame from a Berns o Matic torch to the bullet. Count seconds before the bullet begins to melt. Record the time. Now do the math and determine how long in time a bullet at 1400 fps is exposed to the flame of your propellant in your barrel's length while shooting. Still believe that hooey you were told about bullets melting in a barrel at 1400 fps?
Gary